CN1239391A - Method for determining execution time of inter-frequency hard handoff and establishing hard handoff environment - Google Patents
Method for determining execution time of inter-frequency hard handoff and establishing hard handoff environment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00837—Determination of triggering parameters for hand-off
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0088—Scheduling hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/06—Reselecting a communication resource in the serving access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
- H04W36/38—Reselection control by fixed network equipment
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Abstract
A method for determining the execution time and handoff direction of a hard handoff by a BSC. The service region of the CDMA system is divided as individual cells where each cell further comprises one or more common frequency sub-cells and a border frequency sub-cells. The method of the present invention generally comprises the steps of: receiving a pilot strength measurement message (PSMM), determining whether all sub-cells with which the mobile station is currently in communication are border frequency sub-cells; if not, executing a general handoff; otherwise send a dictate to order PSMM, if pilot signal strengths received are lower than a predetermined power level, activate a timer, if the timer expires, the ordering the mobile station to execute an intra-cell inter-frequency hard handoff.
Description
The present invention relates generally to radio communication, relate in particular to the time of implementation of the direct-cut operation that is undertaken by base station controller (BSC) in a kind of definite code division multiple access (CDMA) mobile communication system and the method for switching direction.
Cell mobile communication systems is divided into a plurality of sub-districts with whole zone, and each sub-district provides service by a base transceiver station (BTS).By base transceiver station being arranged on the central authorities of each sub-district, the user can communicate when each moving between cells each other.That is to say that cellular system configuration can make travelling carriage the sub-district of service is provided and enter and continue to keep conversation when providing another sub-district of service by another BTS shifting out by a BTS.
Fig. 1 illustrates the cellular system structure of using traditional C DMA technology.As shown in Figure 1, this cellular system comprises: travelling carriage (MS) 40, and it receives the mobile communication service; Base transceiver station (BTS) 30,31 is used for providing the mobile communication service to MS40; Base station controller (BSC) 20 is used to control BTS30,31; And mobile switching centre (MSC) 10, BSC20 is linked to each other with public switched telephone network (PSTN) 11.MSC is by providing service from homing user position register (HLR) 12 with the information that calling party location register (VLR) 13 receives relevant MS40.
In cellular system shown in Figure 1, will be called forward link from BTS30,31 to MS40 link usually in the art, and will be called reverse link from MS40 to BTS30,31 link.Share identical pseudo noise (PN) sequence offset with all forward links that particular B TS is related.This PN skew sends by the pilot channel as one of forward channel, and is known as pilot signal.This pilot signal is used to distinguish the identification signal of each BTS.
Cellular system can adopt multiple technologies to hold extra user.A kind of technology wherein is a cell division.In cell division, by interval 3 120 degree antennas are set respectively with 120 °, and with a sub-district trisection, thereby make an antenna-specific in one of 3 sectors.Travelling carriage is identified as independent BTS with each fan antenna.
Use the cellular system and personal communication service (PCS) system of CDMA technology that various switchings are provided, to guarantee the continuous of conversation.By from because travelling carriage moves to another service area since a service area loses the utmost point of the channel of current foundation and set up new channel in the short time, switch and make conversation continuously.Lose a channel and set up the used time of one other channel and want enough little and switching take place so that the user can not perceive.
When must be with the capacity upgrade of cellular system when holding other user, cellular system be that BTS distributes additional frequency (being channel).The so-called FA of Frequency Distribution.This situation usually occurs in the urban area circumstance, under urban area circumstance, since densely populated, so need a lot of FA in the down town.On the contrary, only less FA need be set in the suburb.
In traditional cellular system, when the travelling carriage that communicates by certain frequency channel (being FA) moves to when providing the adjacent service area of service by another BTS of the service that this certain frequency channel is not provided or the BTS that do not have an idle business channel, travelling carriage is then discerned it by the reception pilot signal and is moved into the zone that service is provided by adjacent BTS, and this pilot signal is to receive by the pilot channel that this adjacent BTS sends continuously.In mobile assisted hard hand (mobile assisted hard handoff), the pilot transmitter that separates must be installed by traditional system in travelling carriage, with the pilot signal of identification from adjacent BTS, thereby supports direct-cut operation.
Adopt the method for hard switching of pilot signal to be disclosed in the U.S. Patent No. 5 that is entitled as " method and apparatus (Method and apparatusfor mobile unit assisted hard handoff from a CDMA communication system to analternative access communication system) that is used to provide travelling carriage assisted hard hand " from cdma communication system to other access communication system, 594,718.
In moving auxiliary direct-cut operation, whether the pilot signal strength that travelling carriage uses the pilot transmitter/receiver that is installed in especially in the travelling carriage to detect adjacent BTS meets the demands.If it is satisfied that travelling carriage is determined pilot signal strength,, thereby require to switch to BSC just it calculates the switching determination parameter such as the switching time of implementation.That is to say that in the described MAHO of legacy system, the time of implementation when the pilot signal strength of adjacent BTS equals predetermined power level T_ADD, travelling carriage requires to switch to BSC.
If the transmission frequency by the detected adjacent BTS of travelling carriage is just remaining the pilot beacon that only is used for the direct-cut operation purpose, then this BSC judges: though travelling carriage requires to switch, do not have available respective communication resource in adjacent BTS.So BSC is by transmitting (hand-down) to providing the BTS of service and the common frequency (promptly transmitting tolerance frequency) of the common use of adjacent BTS by current, and carry out inter-frequency hard handoffs.Then, this BSC proceeds to the inter-cell soft handoff of adjacent BTS.
The invention discloses and a kind ofly distribute and to determine the time of implementation of inter-frequency hard handoffs and the method for switching direction between two base station transceivers of (being different FA) when mobile when travelling carriage has different frequency.
Method of the present invention generally comprises following steps: base station controller (BSC) receives Pilot Strength Measurement Message (PSMM) from travelling carriage, and this PSMM comprises a plurality of pilot signals, and each pilot signal has a pilot signal strength; When this BSC receives described PSMM, determine whether current all sub cells that communicate with it of travelling carriage are the edge frequency sub cell; If being determined to a rare sub cell is not the edge frequency sub cell, then carry out general switching; If it is the edge frequency sub cell that all sub cells are confirmed as, then this BSC instructs the PSMM from current all sub cells that communicate with it of travelling carriage periodically; The PSMM that is sent by travelling carriage that receives in response to PSMM that this BSC instructed is analyzed, judge whether the pilot signal strength that receives from all sub cells is lower than predetermined power level T_DOWN; If the pilot signal strength that receives from all sub cells is lower than predetermined power level T_DOWN, then starting is set to the timer of scheduled time T_TDOWN; If full and in time interval T_TDOWN, do not interrupt, then instruct travelling carriage to proceed to inter-frequency hard handoffs in the sub-district of common frequency of service is provided by all base transceiver stations with this timer meter.
The present invention is described with reference to the related content with mobile communication system of the cell structure that is divided into the sector, and still, the present invention more generally is applied in the other system that does not adopt this structural configuration.
Advantage of the present invention is that it can only adopt the software realization and not need additional firmware.
With reference to the accompanying drawing detailed description of the present invention, various purposes of the present invention, feature and advantage will become clearer, in the accompanying drawing:
Fig. 1 illustrates the cellular system structure of using traditional C DMA technology;
Fig. 2 is the exemplary expression that the coverage is divided into 3 sub-districts " A ", " B ", " C ";
Fig. 3 is the flow chart that expression the present invention determines the method for the time of implementation of inter-frequency hard handoffs in the sub-district; With
Fig. 4 is the message flow that expression the present invention is used for determining the method for the time of implementation of inter-frequency hard handoffs in the sub-district.
The invention discloses that a kind of that base station controller (BSC) is determined between frequency is hard The method of the time of implementation of switching. Inter-frequency hard handoffs may be defined as travelling carriage (MS) cut-out in the residential quarter One frequency channels and switch to the switching of another frequency. For the time of implementation of definite inter-frequency hard handoffs, Information must be stored in the database of the base transceiver station (BTS) of being managed by BSC. This information The frequency that comprises each sector among each BTS is distributed (FA). The present invention is sub cell with sector definition. Example As, suppose that the BTS coverage is divided into (sector turns to) to have and be assigned with respectively 2 frequency FA1, FA2 3 sectors. Can think that this coverage comprises 6 sub cells (i.e. (3 sectors) * (2 of every sectors FA)). Sub cell can be defined as according to the service state of common frequency common frequency sub cell or edge frequency again (border frequency) sub cell. That is to say, common frequency sub cell is defined as being total to of its adjacent sub cell The sub cell that frequently all is used. The common frequency that the edge frequency sub cell is defined as its adjacent sub cell does not have The sub cell that all is used.
Except above-mentioned institute canned data, in database for each sub cell storing additional information word Section is to represent the service state of those frequencies that adjacent sub cell shares. This added field represents specific clothes The frequency which of district distribute of being engaged in is current serves in adjacent sub cell.
Fig. 2 is the exemplary expression that the coverage is divided into 3 sub-districts " A ", " B ", " C ".This service area provides service by BTS.As shown in the figure, sub-district " A " further is divided into 2 sub cells that do not carry out the sub cell sectorization.In this example, sub-district " A " is assigned (i.e. management) 2 Frequency Distribution, and wherein FA1 is related with sub cell (1), and FA2 is related with sub cell (2).Frequency Distribution/sub cell association can be expressed as FA1 (1) and FA2 (2) tout court.That is to say, Frequency Distribution 1 (being FA1) is assigned to sub cell (1), and Frequency Distribution 2 is assigned to sub cell (2).
Referring to the sub-district " B " of Fig. 2, it is adjacent with sub-district " A " below, and in this example, sub-district " B " has been assigned with 2 Frequency Distribution, i.e. FA1 and the FA2s identical with sub-district " A ".Frequency Distribution FA2 is assigned to sub cell (3) and (6).But, be that with the difference of sub-district " A " each sub cell 3-7 of sub-district " B " is turned to 3 sectors (α, β, γ) by the sector." A " is adjacent for sectors and β and sub-district, and sector gammai and sub-district " C " is adjacent.Sub-district " B " managing frequency FA1 and FA2.Below with reference to comprising one is not the sub-district " C " of sub cell (8) by the sub cell of sectorization.In this example, 1 Frequency Distribution of sub-district " C " management is FA1.
Following explanation will be referred to two kinds of situations that aforementioned sub cell is respectively common frequency sub cell or edge frequency sub cell.From the sub-district " A ", because each adjacent sub cell (being the sub cell 3 and 4 of sub-district " B ") of sub-district " A " is served all frequencies (being FA1, FA2) by sub-district " A " management, therefore, the sub cell 1 and 2 of sub-district is defined as common frequency sub cell.Correspondingly, because all frequencies (being frequency FA1 and FA2) by sectors adjacent with sub-district " A " and β management are served in sub-district " A ", therefore for sub-district " B ", each sub cell 3,4 of sectors and β and 5 is for being total to sub cell frequently.
The sub cell (6) of the γ sector of the sub-district " B " adjacent with sub-district " C " is defined as common frequency sub cell, and this is because neighbor cell " C " is served FA1.On the contrary, because neighbor cell " C " do not serve FA2, i.e. the Frequency Distribution of sub cell (7), therefore, the sub cell (7) of sub-district " B " is defined as the edge frequency sub cell.
Correspondingly, for sub-district " C ", because neighbor cell " B " serves the frequency of distributing to sub-district " C ", i.e. FA1, therefore, the sub cell (8) of sub-district " C " is defined as common frequency sub cell.
Can not guarantee that the edge frequency sub cell can receive the communication service of corresponding frequencies continuously according to the moving direction of travelling carriage in adjacent BTS.Therefore, the current travelling carriage that is provided service attempts at first to proceed to inter-frequency hard handoffs in the sub-district of common frequency sub cell in this edge frequency sub cell, when not becoming merit, then attempts the inter-cell soft handoff of switching target small area.
In order to proceed to the soft handover of Target cell, BTS must set up at least one frequency in advance as transmitting tolerance frequency from a plurality of frequencies that service is provided.But this transmission tolerance frequency of setting up must be the common frequency of all BTS common service.The feasible soft handover that when travelling carriage begins to call out, can carry out any BTS of the distribution of such frequency.
If stored based on the information of the sub cell of the service state of BTS and allow to carry out Frequency Transfer, then BSC sends the finger the present that requires Pilot Strength Measurement Message (PSMM) by sending pilot measurement request instruction (PMRO) to travelling carriage periodically.This BSC monitors the radio environment of travelling carriage by PSMM.BSC is provided with the cycle of PMRO and it is kept in the BTS database.
If carried out inter-frequency hard handoffs in the sub-district, other requirements are arranged then.The BSC parameter T_DOWN that must set up standard, this parameter is the predetermined threshold corresponding to the received signal intensity level of pilot signal.If the level signal strength that is received by travelling carriage is lower than T_DOWN in the given time, then carry out inter-frequency hard handoffs.This T_DOWN value is set up as the level that is higher than traditional thresholding T_DROP that common direct-cut operation adopts.
The method according to this invention, when BTS instruction travelling carriage carries out in the sub-district inter-frequency hard handoffs, 3 conditions below must satisfying:
Condition 1: wherein travelling carriage all sub cells of establishing channel only are made of the edge frequency sub cell.
Condition 2: wherein travelling carriage establishes all pilot signal strengths of sub cell of channel less than T_DOWN.
Condition 3: on the continuous time that is equal to or greater than scheduled time T_TDOWN, the pilot signal strength of condition 2 is less than thresholding T_DOWN.
Therefore, BSC can confirm that whether above-mentioned 3 conditions satisfy, and determine the time of implementation of inter-frequency hard handoffs in the sub-district by analyzing the PSMM that receives from travelling carriage.
Fig. 3 is the flow chart that expression the present invention determines the method for the time of implementation of inter-frequency hard handoffs in the sub-district.At first, in step 110, BSC receives Pilot Strength Measurement Message (PSMM) from travelling carriage.In step 120, according to the message that receives, BSC can determine that travelling carriage is current with it and just communicate by letter whether the sub cell of (promptly establishing channel) is the edge frequency sub cell.In step 130, if the current any sub cell that communicates with travelling carriage is not the edge frequency sub cell, then BSC carries out general switching (being soft handover).Particularly, if a frequency sub cell is altogether arranged, then BSC proceeds to this soft handover that is total to the target BTS in the frequency sub cell.
Determining current all sub cells that communicate with it of travelling carriage only under the situation of edge frequency sub cell, BSC determines that adjacent BTS can not serve the frequency of the current use of travelling carriage, and can not carry out soft handover.Yet travelling carriage still can be carried out inter-frequency hard handoffs in the sub-district.Whether in order to make this judgement, in step 140, BSC requires PSMM from travelling carriage by sending PMRO message, move to the direction of the BTS that service can not be provided continuously so that determine travelling carriage.In step 150, travelling carriage receives PMRO, and by measure at present can detected all pilot signals intensity, to BSC transmission PSMM, then, BTS receives desired PSMM in response.
In step 160, BTS by analyze according to the PMRO instruction cycle the PSMM that receives judge whether to be necessary to switch.In step 180, when judged result was represented to there is no need to switch, BSC compared the pilot frequency intensity and the predetermined threshold T_DOWN of current all sub cells that communicate with it of travelling carriage, to determine the mobile status of travelling carriage.If the pilot frequency intensity of all sub cells is all less than T_DOWN, then the BSC starting is set to the timer of T_TDOWN.
In step 190,, when having at least a reception value to be not less than threshold level T_DOWN in the signal strength signal intensity of all sub cells, maybe when setting up the additional channel that is total to the frequency sub cell, cancel this timer as the result who analyzes PSMM.In step 190, if this timer meter is full and when not being cancelled during time interval T_TDOWN, then in step 170, BSC instruction travelling carriage carries out inter-frequency hard handoffs in the sub-district.It is the result who keeps below or equal T_DOWN owing to all pilot signal strengths during time interval T_TDOWN continuously that direct-cut operation takes place.
In step 160, if do not comprise the pilot signal strength of BTS in the PSMM that receives periodically, then in step 170, the BSC judgement has switched and has lost (handoff drop), the direct-cut operation between line frequency of going forward side by side.That is to say that travelling carriage sends the instruction of each channel loss that is currently connected to all sub cells.In this case, the channel quality severe exacerbation is so that will take resolute measure.
In step 160, if new pilot signal is appended on the received PSMM, then BSC determines to switch in step 130, and carries out general switching.That is to say that the order travelling carriage is added to the respective channel of new detected sub cell.
In step 170, BSC instruction travelling carriage proceeds to inter-frequency hard handoffs in the sub-district of transmitting tolerance frequency.Carrying out in the sub-district after the inter-frequency hard handoffs, BSC is by determining target BTS and carrying out finishing switching with each step that normally soft handover is relevant.
Fig. 4 is the message flow that expression the present invention is used for determining the method for the time of implementation of inter-frequency hard handoffs in the sub-district.Travelling carriage 40 sends PSMM to BSC periodically or when it detects new pilot signal, and BSC20 receives PSMM from travelling carriage 40.Then, BSC confirms to be edge frequency by PSMM from all pilot signals of travelling carriage report, and in step 210 beginning monitored cells inter-frequency hard handoffs.
In order to carry out inter-frequency hard handoffs in the sub-district, BSC sends PMRO according to the PSMM instruction cycle periodically to travelling carriage.If travelling carriage has been responded PSMM, then whether the BSC pilot signal strength determining to receive by PSMM in step 220 is all less than T_DOWN.If received pilot signal strength is not all to be lower than T_DOWN, then BSC sends PMRO once more in following one-period, and repeats each step of once more received PSMM being compared with T_DOWN in step 230.
If the intensity of the pilot signal that receives by PSMM all is lower than T_DOWN, then BSC is at step 240 starting T_DOWN timer.Then, BSC sends PMRO continuously and receives PSMM.
The intensity of the pilot signal that receives by PSMM by continuous review, BSC determines in step 250 whether the intensity of all pilot signals that receive is lower than T_DOWN in the consecutive periods by the T_TDOWN definition.If this judged result is sure, BSC inter-frequency hard handoffs in step 260 is carried out the sub-district then.
Carry out the travelling carriage of inter-frequency hard handoffs in the sub-district by the instruction of BSC, can easily proceed to the soft handover of target BTS.
Although describe specific embodiments of the invention with reference to accompanying drawing in detail with exemplary forms above, the present invention also can have various distortion and replacement form.Should be understood that the present invention is not limited to above-mentioned particular forms disclosed, on the contrary, the present invention falls into aim of the present invention and all modifications in the scope, equivalence and the replacement form that claims limit with covering.
Claims (14)
1. the method for the time of implementation of the inter-frequency hard handoffs of a mobile communication system that is used for determining being divided into a plurality of sectors, described communication system comprises: at least one travelling carriage, for the user provides the mobile communication service; A plurality of base transceiver stations (BTS), each in them provides service for one of described a plurality of sectors, and each BTS sends unique pilot signal of the described BTS of identification; And base station controller, being used to manage sub cell, described method comprises the steps:
(a) base station controller (BSC) receives Pilot Strength Measurement Message (PSMM) from travelling carriage, and described PSMM comprises a plurality of pilot signals, and each pilot signal has a pilot signal strength;
(b) when described BSC receives described PSMM, determine whether current all sub cells that communicate with it of travelling carriage are the edge frequency sub cell;
(c) if being determined to a rare sub cell is not the edge frequency sub cell, then carry out general switching;
(d) if to be confirmed as be the edge frequency sub cell to all sub cells, then described BSC sends the instruction of requirement from the PSMM of current all sub cells that communicate with it of travelling carriage periodically;
(e) the received PSMM that is sent by described travelling carriage of PSMM instruction that sends in response to described BSC is analyzed, to judge whether the pilot signal strength that receives from all sub cells is lower than predetermined power level T_DOWN, if this judged result is sure, then starting is set to the timer of scheduled time T_TDOWN; With
(f), then instruct described travelling carriage to proceed to inter-frequency hard handoffs in the sub-district of common frequency of service is provided by all base transceiver stations if the normal meter of described timer is full.
2. the method for claim 1, wherein said T_DOWN power level is set to larger than the power level of handover loss thresholding T_DROP.
3. method as claimed in claim 2, wherein after the step of the described timer of starting, described method also comprises if judge that in step (e) pilot signal strength of all received sub cells is not less than the step that T_DOWN just cancels described timer and turns back to step (d).
4. method as claimed in claim 3, described method also comprise if judge that in step (e) pilot signal strength of all received sub cells is lower than the step that T_DOWN just turns back to step (d).
5. the method for claim 1, wherein said method also comprise if the result who analyzes desired PSMM is for judging the needs step then generally switched of frequency sub cell additional channel altogether.
6. method as claimed in claim 5, wherein said method also comprise the step that stops described PSMM instruction and cancel described timer.
7. method as claimed in claim 5, wherein said needs altogether the judgement of sub cell additional channel frequently be according to as partial periodicity PSMM message sink to together frequently the pilot signal that newly receives of sub cell association make.
8. the method for claim 1, if wherein judge according to described analytical procedure and must lose all sub cells, then described method also comprises the step of inter-frequency hard handoffs in the sub-district that proceeds to common frequency.
9. method as claimed in claim 8, the wherein said judgement that must lose all sub cells are to make according to all sub cells with the associated pilot signals intensity that is lower than handover loss thresholding T DROP.
10. the method for claim 1, the step of the described timer of wherein said starting also comprises the steps:
(a) judge whether described T_TDOWN timer starts; With
(b) if described T_TDOWN timer starts, then turn back to described step (d), otherwise start described T_TDOWN timer.
Be arranged to the described step of frequency altogether 11. method as claimed in claim 10, the step of the described timer of wherein said starting also comprise with transmitting tolerance frequency, described is for carrying out the frequency that inter-frequency hard handoffs is distributed altogether frequently.
12. method as claimed in claim 11, wherein said base station controller is stored described frequency altogether according to each base transceiver station unit.
13. the method for the time of implementation of an inter-frequency hard handoffs that is used for determining mobile communication system, described mobile communication system comprises: travelling carriage, communicate with a plurality of base stations, and each base station sends the pilot signal that is used for discerning uniquely each base station; A plurality of base transceiver stations, each base transceiver station provides service at least one sector, and has the different intrinsic pilot signal of frequency respectively; And base station controller, the switching that is used to connect described a plurality of base station and mobile switching centre and controls travelling carriage, described method comprises the steps:
(a) frequency configuration that the adjacent base station transceiver station can be served becomes the common frequency in all current sub cells of serving, and the frequency configuration that the adjacent base station transceiver station can not be served is become edge frequency in all current sub cells of serving;
(b), judge that then whether the power level of the pilot signal strength of all sub cells is lower than T_DOWN on the continuous time of T_TDOWN at least if judge that all current sub cells of serving are the edge frequency sub cell;
(c), then instruct described travelling carriage to proceed to inter-frequency hard handoffs in the sub-district of current all sub cells that communicate with it of described travelling carriage if the result of described judgement is sure.
14. the method for the time of implementation of inter-frequency hard handoffs in the sub-district that is used for determining mobile communication system, described mobile communication system comprises: travelling carriage, subscriber signal is connected to a plurality of base stations, and the employing pilot signal is differentiated each base station; A plurality of base transceiver stations are made of at least one sector, and have the different intrinsic pilot signal of frequency respectively; And base station controller, be used to connect described a plurality of base station and mobile switching centre, and be used to control the switching of travelling carriage, described method comprises the steps: that at least one is transmitted tolerance frequency is arranged to common frequency, and described transmission tolerance frequency is the target frequency of inter-frequency hard handoffs in the sub-district in all current frequencies of serving.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980022290A KR100277058B1 (en) | 1998-06-15 | 1998-06-15 | A method for deciding the starting time of inter-frequency hard handoff and a method for initiating of hard handoff in mobile telecommunication system |
| KR22290/1998 | 1998-06-15 | ||
| KR22290/98 | 1998-06-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1239391A true CN1239391A (en) | 1999-12-22 |
| CN1117504C CN1117504C (en) | 2003-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99108437A Expired - Fee Related CN1117504C (en) | 1998-06-15 | 1999-06-14 | Method for determining execution time of inter-frequency hard handoff and establishing hard handoff environment |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6449481B1 (en) |
| KR (1) | KR100277058B1 (en) |
| CN (1) | CN1117504C (en) |
| RU (1) | RU2178239C2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004015901A1 (en) * | 2002-08-08 | 2004-02-19 | Zte Corporation | A method for decide cdma frequency hard hand-off |
| CN1312957C (en) * | 2001-05-04 | 2007-04-25 | 摩托罗拉公司 | Method and appts. for setting pilot signal transmit powers |
| WO2009039757A1 (en) * | 2007-09-20 | 2009-04-02 | Huawei Technologies Co., Ltd. | Method and apparatus for implementing a hard handover in boundary area |
| CN101119570B (en) * | 2000-05-19 | 2010-10-13 | 阿尔卡塔尔公司 | Method for signaling of the compressed mode parameters to a mobile station |
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| CN102860076A (en) * | 2010-03-29 | 2013-01-02 | 高通股份有限公司 | Maintaining Different Virtual Active Sets For Different Cell Types |
| CN102860076B (en) * | 2010-03-29 | 2016-02-24 | 高通股份有限公司 | Different dummy activity collection is maintained for different cell types |
| CN102835154A (en) * | 2010-04-02 | 2012-12-19 | 诺基亚公司 | Method and apparatus for maintaining a virtual active set including a closed subscriber group cell |
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| CN102835154B (en) * | 2010-04-02 | 2015-04-08 | 诺基亚公司 | Method and apparatus for maintaining a virtual active set including a closed subscriber group cell |
Also Published As
| Publication number | Publication date |
|---|---|
| US6449481B1 (en) | 2002-09-10 |
| KR20000001838A (en) | 2000-01-15 |
| KR100277058B1 (en) | 2001-01-15 |
| CN1117504C (en) | 2003-08-06 |
| RU2178239C2 (en) | 2002-01-10 |
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